I did search the archives, and the most recent post seems to date to 2004. We have 1 ICP-MS and 1 operator (me). I do other things sometimes. So I find the ICP-MS seems to alternate between sitting idle, sometimes for weeks, and being used 24/7. Liquid dewars of argon inevitably blow off during idle times, sometimes leaving me without argon. I will sometimes use 2 compressed cylinders simultaneously to get through an overnight run. I am think of installing a manifold system, preferably that could take either cylinders or dewars. Getting a 16 cylinder pallet doesn't really seem practical for my lab setup. I have one quote so far for a 4 cylinder manifold, but it uses a brass header, which I believe would be part of the flowpath. Is this problematic when doing trace analysis? I am under the impression I should stick with SST. Are there vendors out there other than Airgas or Tescom that I should be looking at? Does anyone else use a changeover system that can be supplied by either compressed cylinders or liquid dewars, depending on anticipated use?
Mary C. Carson, Ph.D.
Center for Veterinary Medicine
Office of Research, Division of Residue Chemistry
U.S. Food and Drug Administration
[log in to unmask]<mailto:[log in to unmask]>